/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.nexmark.queries;



import com.bff.gaia.unified.sdk.nexmark.NexmarkConfiguration;

import com.bff.gaia.unified.sdk.nexmark.NexmarkUtils;

import com.bff.gaia.unified.sdk.nexmark.model.Auction;

import com.bff.gaia.unified.sdk.nexmark.model.Event;

import com.bff.gaia.unified.sdk.nexmark.model.NameCityStateId;

import com.bff.gaia.unified.sdk.nexmark.model.Person;

import com.bff.gaia.unified.sdk.values.TimestampedValue;

import com.bff.gaia.unified.vendor.guava.com.google.common.collect.ArrayListMultimap;

import com.bff.gaia.unified.vendor.guava.com.google.common.collect.Multimap;

import org.joda.time.Instant;



import java.io.Serializable;

import java.util.Collection;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;



/** A direct implementation of {@link Query3}. */

public class Query3Model extends NexmarkQueryModel<NameCityStateId> implements Serializable {

  /** Simulator for query 3. */

  private static class Simulator extends AbstractSimulator<Event, NameCityStateId> {

    /** Auctions, indexed by seller id. */

    private final Multimap<Long, Auction> newAuctions;



    /** Persons, indexed by id. */

    private final Map<Long, Person> newPersons;



    public Simulator(NexmarkConfiguration configuration) {

      super(NexmarkUtils.standardEventIterator(configuration));

      newPersons = new HashMap<>();

      newAuctions = ArrayListMultimap.create();

    }



    /** Capture new result. */

    private void addResult(Auction auction, Person person, Instant timestamp) {

      TimestampedValue<NameCityStateId> result =

          TimestampedValue.of(

              new NameCityStateId(person.name, person.city, person.state, auction.id), timestamp);

      addResult(result);

    }



    @Override

    protected void run() {

      TimestampedValue<Event> timestampedEvent = nextInput();

      if (timestampedEvent == null) {

        allDone();

        return;

      }

      Event event = timestampedEvent.getValue();

      if (event.bid != null) {

        // Ignore bid events.

        return;

      }



      Instant timestamp = timestampedEvent.getTimestamp();



      if (event.newAuction != null) {

        // Only want auctions in category 10.

        if (event.newAuction.category == 10) {

          // Join new auction with existing person, if any.

          Person person = newPersons.get(event.newAuction.seller);

          if (person != null) {

            addResult(event.newAuction, person, timestamp);

          } else {

            // Remember auction for future new person event.

            newAuctions.put(event.newAuction.seller, event.newAuction);

          }

        }

      } else {

        // Only want people in OR, ID or CA.

        if ("OR".equals(event.newPerson.state)

            || "ID".equals(event.newPerson.state)

            || "CA".equals(event.newPerson.state)) {

          // Join new person with existing auctions.

          for (Auction auction : newAuctions.get(event.newPerson.id)) {

            addResult(auction, event.newPerson, timestamp);

          }

          // We'll never need these auctions again.

          newAuctions.removeAll(event.newPerson.id);

          // Remember person for future auctions.

          newPersons.put(event.newPerson.id, event.newPerson);

        }

      }

    }

  }



  public Query3Model(NexmarkConfiguration configuration) {

    super(configuration);

  }



  @Override

  public AbstractSimulator<?, NameCityStateId> simulator() {

    return new Simulator(configuration);

  }



  @Override

  protected Collection<String> toCollection(Iterator<TimestampedValue<NameCityStateId>> itr) {

    return toValue(itr);

  }

}